Coal and rock drill



(No Model.)

J. F. LOFTU-S. GOAL AND BOOK DRILL. No. 328,495. Patented Oct. 20, 18.85..

WITNESSES 4 I I I 126% 9 ATTORNEYS.

rArEs Nrrn JAMES F. LOFTUS, OF \VINTON, PENNSYLVANIA.

COAL AND ROCK DRILL.

SFECIFICATION forming part of Letters Patent No. 328,495, dated October 20, 1885.

Application filed February 4, 1885. Serial No. 154,888.

T0 to whom, it may concern.

Be it known that 1, JAMES F. Lorrus, of Winton, in the county of Lackawanna and State of Pennsylvania, have invented certain new and useful Improvements in Coal and Rock Drills, of which the following is a full, clear, and exact description.

My invention is an improvement in a class of coal and rock drilling machines in which the stem or shank of the drill proper is screwthreaded and works through a nut hinged or swiveled to a suit-able support.

The invention consists in the construction and combination of parts hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is an elevation of my improved drill as at work. Fig. 2 is an enlarged side elevation of the jointed ends of the main drill and its extension-bar with the socket of the drill in section and the parts in position for use. Fig. 3 is a sectional side elevation illustrating the manner of inserting the end of the extension-bar into the drill-socket. Fig. 4 is a plan View at right angles with Fig. 2, and Fig. 5 is afront elevation of the crank by which the screw-shaft is turned.

The letter A indicates the fastening bar or standard of the drill, the inner end of which has ribs a, which are forced into the sides of a hole made in the coal or rock 13 to be mined by driving a wedge, 0, along the flat back side of the bar A, in the usual manner, so that the bar projects into the cutting or shaft D at a proper angle or position to support the drilling mechanism. The fastening-bar A has a series of holes, a, through it, and a hole, a", at its end at a right angle with the others to re ceive the pivot e of the yoke or clevis E, which may be held in any one of the holes by a nut, F, as shown in Fig. 1.

G is the nut, which is pivoted between the side arms of the yoke E, and H is the drilloperating screw, which is threaded into the nut G, and has a square or fiat sided shank at each end which will fit any one of the holes 73 in the crank I, and sockets made in the back ends of the drills, and of the extension drillbar J, which bar J is fitted to the long drill K (No model.)

in a peculiar manner presently described. I make the drill K and extension-bar J preferably in the twisted form shown, and the drill may have any preferred shape at its cutting end.

An important feature of my invention is the manner of connecting the bar J to the drill K, so they may readily be separated when the drill is withdrawn from the hole, and will be inseparable while the joint or connection is in the hole to allow the drill to always be easily and quickly withdrawn. In making this joint I form on the inner end of the extensionbar J the tenon L, which is cut 011 an angle or bevel at one side of its inner end, as at Z,- and in the edge of the tenon opposite the beveled partZ is fixed a pin or stud, M, which, when the tenon L is passed into the socket N formed in the back end of the drill K, enters a slot, 0, in the side wall of said socket N, as in Fig. 2.

To connect or disconnect the extension-bar J with or from the drill K, the bar must be brought to the position shown in Fig. 3, or at an angle of about forty-five degrees with the line of the drill, when the end bevel at Z will rest on the edge or wall of the socket opposite the slot 0, while the pin M enters or leaves the slot. As the tenon L loosely fits the socket N the pin M is not subjected to breaking strains, while the drill is worked by the aid of the extension-bar.

In using the drill the nut-supporting yoke E will be swiveled in one of the holes of the bar A, and the screw H will be run back, and a short drillsay about twofeet longwill be applied at its forward end to start the hole and bore it for about two feet, which is the working length or stroke of the screw. The screw then will be turned back a little to draw it from the drill-socket, will be swung around with the yoke E, and the handle Ifastened to its other end. four feet long, is then to be inserted in the hole, and the end of the screw H entered in its socket N. The screw will again be advanced its full length or until the drill K has bored for nearly its full length. The screw H will again be backed and swung around end for end, and the extension-bar J connected to the drill K, as above described, the end of the screw will enter the back-end socket of the The drill K, which is about 5 bar J to turn it, and the drill to complete the with the drill K, having a socket, N, and slot boring of the hole for the full length of the O, of the extension-bar J, having a tenon, L, drill K, or farther, as in Fig. l, the joint of adapted to the socket, and provided with the the bar and drill remaining rigid to hold the end bevel Z, and a pin, M, adapted to enter 20 5 bar and drill in line for boring a straight hole, slot 0, substantially as herein set forth.

from which the drill may easily be Withdrawn 2. In drilling-machines, the drill K and ex by pulling on the projecting bar J. tension-bar J made in twisted form, and said By swiveling the yoke E to the bar A and drill having the end socket, N, and slot 0, and pivoting the nut G to the yoke E, I am enthe extension-bar having the tenon L, pro- 25 I0 abled to bore or drill holes horizontally, vided with the end bevel Z and pin M, subperpendicularly, or at any desired angle, as stantially as herein set forth.

will readily be understood.

Having thus described my invention, What JAMES LOFTUS' P I claim as new, and desire to secure by Let- Witnesses: r 5 ters Patent, is W. J. BURKE,

1. In drillingmachines, the combination, JOHN FINNIGAN. 

